Bobcat 843 with SB200 72" snowblower binds up with snow

[newstang]

Hi all, new to this forum.
I have an 843 and a 72" blower. The impeller seems to jam itself up with a minimal amount of heavy snow.. Shouldn't it being hydraulic be able to rip through it?
when i do get it going it also blocks up the chute. I find it strange something this big is so weak. Is it possible the motor for the impeller is weak? I also do not know whether this machine is high flow or not, but i can say when there is no snow in it the impeller spins fast.

 

[Dave1234]

I have a 742B (36 hp, low flow), with a 5' snow blower. Located in No. Calif, so get all kinds of snow--light to heavy. With heavy snow, I have to proceed very slowly, watching the discharge chute carefully, and listening to motor RPMs. If the discharge distance falls off, meaning the blower is slowing down, I need to slow down. Otherwise the chute will clog with snow. Also need to plan ahead for any stops to make sure everything is blown clear before stopping or the chute will clog. And my blower has an odd "feature" If I set the hyd flapper controlling the discharge angle at its extreme ends and continue to energize its hyd solenoid , all other hyd functions stop, again leading to clogging. I found it took several storms to get reasonably good with mine, along with some mods. to deal with my rough dirt driveway. My conclusion is that with heavy snow, using a large snowblower is more of an art than just overpowering the snow.

 

[mrbb]

MY first question here would be what is the required GPM flow rate of this blower, and what is your machine rated at putting out
its sadly some what common for folks to buy blowers that are not correct size and that leaves the skid un able to run it, due to not making enough GPM flow rate for blower to work right
add in wet or heavy snow/ice, and things only get worse!
SO< on this blower, what is the required flow rate
and is your machine actually capable;e of maintaining what it needs?

if not, then, you may need a different blower to mate up to your machine!
sorry if not what you want to hear, but from my experience is the most common problem when folks says things ain;'t working right
next is going too fast,

SO< what are the rates on machine/blower??

 

[laurencen]

stupid question is it running backwards

 

[ward]

Hi all, new to this forum.
I have an 843 and a 72" blower. The impeller seems to jam itself up with a minimal amount of heavy snow.. Shouldn't it being hydraulic be able to rip through it?
when i do get it going it also blocks up the chute. I find it strange something this big is so weak. Is it possible the motor for the impeller is weak? I also do not know whether this machine is high flow or not, but i can say when there is no snow in it the impeller spins fast.

A quick search of the internet says 843 bob cat aux flow is 16 gal a gpm and the sb20072 is a 21-26 gpm unit per specs, I would call bobcat and verify that thoes are correct, I would think it would work but you will need to creep along to blow snow.

 

[newstang]

A quick search of the internet says 843 bob cat aux flow is 16 gal a gpm and the sb20072 is a 21-26 gpm unit per specs, I would call bobcat and verify that thoes are correct, I would think it would work but you will need to creep along to blow snow.

do you think the impeller motor can be changed to a 16 gpm to make it work better? looking at at in operation it pins really fast. problem is it has no torque, just about anything will block it from spinning

 

[ward]

well think about it like this, replacing the 21-26 gpm with a 16 gpm motor is like rereplacing a 21-25 hp gas engine that you can can only run at 70-80% with a 16hp that you can run at 100% , not a 100% differance in thought, I don't think you will find a 16 gpm motor that has the same torque spec as what is now on the blower I think either way keeping ground speed at a point that the fan speed stays up, it also my not be reaching the desired speed of the fan with what your unit has for flow either and a 16 gpm would give you that speed just not the torque, however it may improve it.

 

[newstang]

stupid question is it running backwards

no, although I have done it before

 

[spitzair]

One thing I have learned with our SB200 at work is if you keep your snowblower attached to your machine and park it inside, then go outside in sub freezing temperatures to blow snow it will clog up real fast until the chute cools off to the temperature of the snow you're blowing through it. What we do now is leave the blower outside and just hook it to the machine when we need it and we've had a drastic decrease in clogs.
Also like others have said don't go faster than what the blower can handle. Just because you have a 50hp engine in your loader doesn't mean you get 50hp out of your aux hydraulics. I'm not sure what psi your machine runs at but at 16gpm and 2250 psi you get about 20 hydraulic horsepower which isn't all that much for a 72" wide snowblower, heck those walk behind 24" units are close to that. One of the guys at work isn't all that patient and always complains the snowblower doesn't throw the snow very far but he's always trying to do everything at 90 miles an hour, go too fast and you'll overwhelm your blower motor and it won't blow far and/or it'll clog up… hope this helps!

 

[newstang]

One thing I have learned with our SB200 at work is if you keep your snowblower attached to your machine and park it inside, then go outside in sub freezing temperatures to blow snow it will clog up real fast until the chute cools off to the temperature of the snow you're blowing through it. What we do now is leave the blower outside and just hook it to the machine when we need it and we've had a drastic decrease in clogs.
Also like others have said don't go faster than what the blower can handle. Just because you have a 50hp engine in your loader doesn't mean you get 50hp out of your aux hydraulics. I'm not sure what psi your machine runs at but at 16gpm and 2250 psi you get about 20 hydraulic horsepower which isn't all that much for a 72" wide snowblower, heck those walk behind 24" units are close to that. One of the guys at work isn't all that patient and always complains the snowblower doesn't throw the snow very far but he's always trying to do everything at 90 miles an hour, go too fast and you'll overwhelm your blower motor and it won't blow far and/or it'll clog up… hope this helps!

yea, mine is outside, my neighbor has a walk behind and his shit never clogs. nor does his impeller get stuck. i cant beleive it doest have enough power to keep spinning even if the chute is clogged. lets see how it does today with a layer of ice

 

[newstang]

while im here, does anyone else have an 1980's 843? I was told when you activate the hydraulics by pushing the handle to the right it should lock in, mine does not. nor is there anything when i lift the cab to look for thet bolt that needs to be removed. Just a pain in the ass to hold it while trying to move the machine.

 

[brdgbldr]

while im here, does anyone else have an 1980's 843? I was told when you activate the hydraulics by pushing the handle to the right it should lock in, mine does not. nor is there anything when i lift the cab to look for thet bolt that needs to be removed. Just a pain in the ass to hold it while trying to move the machine.

On the older machines there was a detent when you push the lever all the way to the right. This would hold the auxiliary on. Then you needed to pull the lever to the left to stop it. It sounds like your detent is worn out or missing.

The detent ball and spring are replaceable.

The bolt was in place to stop the auxiliaries from engaging entirely. Since the lever actually moves to the right, and your auxiliary works, the bolt has been removed.

 

[newstang]

On the older machines there was a detent when you push the lever all the way to the right. This would hold the auxiliary on. Then you needed to pull the lever to the left to stop it. It sounds like your detent is worn out or missing.

The detent ball and spring are replaceable.

The bolt was in place to stop the auxiliaries from engaging entirely. Since the lever actually moves to the right, and your auxiliary works, the bolt has been removed.

any advice on where the location is to replace it?
thx

 

[oiu789]

Check that the quick connects are working properly. I have had them fail and stop up the hyd flow.

 

[brdgbldr]

any advice on where the location is to replace it?
thx

It is on the auxiliary spool valve in the control valve. Here a link to a video on replacing a detent for a float valve:


Here is a link to the parts catalog. The schematics should help you locate the valve you need to work on:

Bobcat Parts Catalog - Find Diagrams for Your Equipment - Bobcat Company

Locate all parts and component information about your Bobcat equipment with detailed visual diagrams and illustrations with parts numbers and add to your list.

partscatalog.bobcat.com

 

[laurencen]

what size hoses are you running? for years my ayger ran slow low pwer, the previous owner ran 3/8 hoses, now run 5/8 different machine, couplers and bushings will also restrict flow

 

[newstang]

It is on the auxiliary spool valve in the control valve. Here a link to a video on replacing a detent for a float valve:


Here is a link to the parts catalog. The schematics should help you locate the valve you need to work on:

Bobcat Parts Catalog - Find Diagrams for Your Equipment - Bobcat Company

Locate all parts and component information about your Bobcat equipment with detailed visual diagrams and illustrations with parts numbers and add to your list.

partscatalog.bobcat.com

Thanks!

 

[newstang]

what size hoses are you running? for years my ayger ran slow low pwer, the previous owner ran 3/8 hoses, now run 5/8 different machine, couplers and bushings will also restrict flow

not sure but they are big, defiantly not ⅜

 

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